var sourceCode = "";
!(function(window, document) {
	function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数
		this.options = { //默认options参数值
				id: "", //容器Id
				canvasId: "verifyCanvas", //canvas的ID
				width: "143", //默认canvas宽度
				height: "43", //默认canvas高度
				type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
				code: ""
		}

		if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型
			for(var i in options) { //根据传入的参数，修改默认参数值
				this.options[i] = options[i];
			}
		}else{//传入单个对象就是id
			this.options.id = options;
		}

		this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");//数字
		this.options.letterArr = getAllLetter();//生成字母数组
		this._init();//初始化
		this.refresh();//生成验证码
	}

	GVerify.prototype = {
			/**版本号**/
			version: '1.0.0',

			/**初始化方法**/
			_init: function() {
				var con = document.getElementById(this.options.id);//获得验证码的DIV
				var canvas = document.getElementById(this.options.canvasId);//获得画布   IE不能支持canvas，可以增加excanvas.js插件，但是还是不支持createelement()的形式
				this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "143";//如果有宽度就使用自己的，没有就默认100
				this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "43";//如果有长度就使用自己的，没有就默认30
//				canvas.id = this.options.canvasId;//为兼容IE把这些去掉
//				canvas.width = this.options.width;
//				canvas.height = this.options.height;
//				canvas.style.cursor = "pointer";
//				canvas.innerHTML = "您的浏览器版本不支持canvas";
//				con.appendChild(canvas);
				var parent = this;//把this赋值parent
				canvas.onclick = function(){//验证码点击切换刷新
					parent.refresh();
				}
			},

			/**生成验证码**/
			refresh: function() {
				this.options.code = "";//定义验证码为""
				var canvas = document.getElementById(this.options.canvasId);//获得验证码画布

//				var context = canvas.get(0).getContext('2d');  //获取canvas上下文


				if(canvas.getContext) {//
					var ctx = canvas.getContext('2d');//获得绘画对象
					ctx.clearRect(0, 0, canvas.width, canvas.height);//重设清除画布
				}else{//
					return;
				}


				ctx.textBaseline = "middle";
				ctx.fillStyle = randomColor(180, 240);
				ctx.fillRect(0, 0, this.options.width, this.options.height);//绘制矩形
				/* x:矩形起点横坐标（坐标原点为canvas的左上角，当然确切的来说是原始原点，后面写到变形的时候你就懂了，现在暂时不用关系）
 y:矩形起点纵坐标
 width:矩形长度
 height:矩形高度*/
				if(this.options.type == "blend") { //判断验证码类型 blend:数字字母混合类型、number:纯数字、letter:纯字母
					var txtArr = this.options.numArr.concat(this.options.letterArr);
				} else if(this.options.type == "number") {
					var txtArr = this.options.numArr;
				} else {
					var txtArr = this.options.letterArr;
				}
				for(var i = 1; i <= 4; i++) {
					var txt = txtArr[randomNum(0, txtArr.length)];//取得一个字符
					this.options.code += txt;//连接验证码
					ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
					ctx.fillStyle = randomColor(50, 160); //填充的样式 随机生成字体颜色
					ctx.shadowOffsetX = randomNum(-3, 3);//阴影的横向位移量
					ctx.shadowOffsetY = randomNum(-3, 3);//阴影的纵向位移量
					ctx.shadowBlur = randomNum(-3, 3);//阴影的模糊范围（值越大越模糊）
					ctx.shadowColor = "rgba(0, 0, 0, 0.3)";//阴影的颜色
					var x = this.options.width / 5 * i;
					var y = this.options.height / 2;
					var deg = randomNum(-30, 30);
					/**设置旋转角度和坐标原点
					 *
					 *  平移context.translate(x,y)
					 *    x:坐标原点向x轴方向平移x
					 *    y:坐标原点向y轴方向平移y
					 *
					 * **/
					ctx.translate(x, y);
					ctx.rotate(deg * Math.PI / 180);//旋转context.rotate(angle)
					ctx.fillText(txt, 0, 0);//context.fillText(text,x,y)
					/**恢复旋转角度和坐标原点**/
					ctx.rotate(-deg * Math.PI / 180);
					ctx.translate(-x, -y);
				}
                sourceCode = this.options.code;
				/**绘制干扰线**/
				for(var i = 0; i < 4; i++) {
					ctx.strokeStyle = randomColor(40, 180);//随机颜色
					ctx.beginPath();//路径  context.beginPath()
					ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));//绘制线段 context.moveTo(x,y)  context.lineTo(x,y)
					ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
					ctx.stroke();
				}
				/**绘制干扰点**/
				for(var i = 0; i < this.options.width/4; i++) {
					ctx.fillStyle = randomColor(0, 255);
					ctx.beginPath();
					ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);// 圆弧context.arc(x, y, radius, starAngle,endAngle, anticlockwise)
					ctx.fill();
				}
			},

			/**验证验证码**/
			validate: function(code){
				var code = code.toLowerCase();
				var v_code = this.options.code.toLowerCase();
				//console.log(v_code);
				if(code == v_code){
					return true;
				}else{
					this.refresh();
					return false;
				}
			}
	}
	/**生成字母数组**/
	function getAllLetter() {
		var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
		return letterStr.split(",");
	}
	/**生成一个随机数**/
	function randomNum(min, max) {
		return Math.floor(Math.random() * (max - min) + min);
	}
	/**生成一个随机色**/
	function randomColor(min, max) {
		var r = randomNum(min, max);
		var g = randomNum(min, max);
		var b = randomNum(min, max);
		return "rgb(" + r + "," + g + "," + b + ")";
	}
	window.GVerify = GVerify;//设置为window对象
})(window, document);